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Rex-1.16.1
⭐ Starred 717 / Rex::Transaction
Security Advisories (1)
CVE-2026-94140 (2026-10-21)

Rex versions through 1.16.1 for Perl accept an unknown SSH host key for remote rsync transfers because sync hardcodes StrictHostKeyChecking=no. Every remote branch of sync builds its ssh command with that option, for password authentication, for private-key authentication and for the fallback. The ssh options a caller sets through set_openssh_opt reach the OpenSSH transport but not this command, so there is no configuration that restores host key checking for the transfer. An attacker who can redirect the connection before the real host key is known presents their own and the transfer proceeds: under password authentication sync sends the connection password to that server, an upload writes the selected local files to it, and a download writes what it returns to the local destination.

NAME

Rex::Transaction - Transaction support

DESCRIPTION

With this module you can define transactions and rollback scenarios on failure.

SYNOPSIS

use Rex::Transaction;

task 'do-something', 'server01', sub {
  transaction {
    on_rollback {
      rmdir '/tmp/mydata';
    };

    mkdir '/tmp/mydata';
    upload 'files/myapp.tar.gz', '/tmp/mydata';
    run 'tar xzf myapp.tar.gz -C /tmp/mydata';
    if ( $? != 0 ) { die('Error extracting myapp.tar.gz'); }
  };
};

EXPORTED FUNCTIONS

transaction($codeRef)

Start a transaction for $codeRef. If $codeRef dies, Rex will run the on_rollback code to roll back the transaction.

task 'deploy', group => 'frontend', sub {
  on_rollback {
    rmdir '...';
  };

  deploy 'myapp.tar.gz';
};

task 'restart_server', group => 'frontend', sub {
  service apache2 => 'restart';
};

task 'all', group => 'frontend', sub {
  transaction {
    do_task [qw/deploy restart_server/];
  };
};

on_rollback($codeRef)

This will execute $codeRef if a step in the transaction fails.